package com.dz.Incubator.config;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import springfox.documentation.RequestHandler;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class Swagger2Config extends WebMvcConfigurationSupport {

    // 定义分隔符
    private static final String splitor = ";";

    @Bean
    public Docket createApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
//                .apis(RequestHandlerSelectors.basePackage("cn.cloud.ebiz.webapi.front.controller"))
                .apis(basePackage("com.dz.Incubator.controller"))
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("Swagger2")
                .description("RESTful API接口")
                .version("1.0.1")
                .build();
    }

    /**
     * 解决swagger-ui.html 404无法访问的问题
     */
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        // 解决静态资源无法访问
        registry.addResourceHandler("/**")
                .addResourceLocations("classpath:/static/");
        // 解决swagger无法访问
        registry.addResourceHandler("/swagger-ui.html")
                .addResourceLocations("classpath:/META-INF/resources/");
        // 解决swagger的js文件无法访问
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

    /**
     * 以下为配置多包扫描
     */


    public static Predicate<RequestHandler> basePackage(final String basePackage) {
        return input -> declaringClass(input).transform(handlerPackage(basePackage)).or(true);
    }

    private static Function<Class<?>, Boolean> handlerPackage(final String basePackage) {
        return input -> {
            // 循环判断匹配
            for (String strPackage : basePackage.split(splitor)) {
                boolean isMatch = input.getPackage().getName().startsWith(strPackage);
                if (isMatch) {
                    return true;
                }
            }
            return false;
        };
    }

    private static Optional<? extends Class<?>> declaringClass(RequestHandler input) {
        return Optional.fromNullable(input.declaringClass());
    }

}
